Insulating tube



W. HIER.

'INSULATING TUBE.

APPLICATION FILED APR. I7 i922.

1,431,798', Patented 00u10 1922.

Patented Get. io, 1922.

U i 'ren s "r TES,

mama

iNsuLA'riNG TBEK.

Application inea april 17, i922.- serial ne.y 553,675.`

To all whom t may concern.'

Be it known that IVILLiAM Hina, a citizen of the United States of America, residing at Canaanville, Ohio, in th jcounty .of Athens and State of Ohio,'hasv in VTented certain new and useful Improvements in Insulating Tubes, of which the lfollowing is a speciparticularly to a means for ltiring the shot or blasting cartridge. 1

One of the principal objects of my invention is to provide a charge or shotgiiring `appliance,'designed to isolate the match end of the squib from the combustible gases which escape from the drilled hole which receives said blasting charge, tothe end that the yentire match may not be instantly consumed and ignite the powder containing portion of the squib before the operator has had an opportunity to depart Yto a. point of safety before the charge is fired.

It will therefore be observed that the aimv of this invention is to provide a charge tiring device which will permit of the usual functioning of the squib without danger of pre-ignition when used under conditionswliere niarsh-gas particularly, is present in the coal strata, and escapes to the mouth of the bore-hole at face of the wall.

Specifically, the invention contemplates a device of tubular form preferably metal, adapted to be inserted for va portion of its length into the usual needle hole, which tubular device is provided with a series of longitudinally spaced radial apertures, which are so arranged that gases passing outwardly through the needle hole may be permitted to escape at a point adjacent the mouth thereof and spaced from the 'point rof ignition of the squib.

VhiIe the usual manner of tiring charges is of course well known to those familiar with mining operations, it might be well for the purpose of more clearly illustrating the use of my device as distinguished from the old method, to very briefly review the latter: According to the old method after the removal of the needle from the needle hole, the powder containing portion of the squib or fuse was inserted within said needle hole, the remaining two or three inches of the match end of the fuse extending without the needle hole. the extreme free end of the match which is The next step was to ignite designed to llourirslowly"enough4 tofpermit the operator to retire'to a point at a safe distance from the place ofv blasting. This operation .waszsatisfactory and the4 fuse performed7 its function properly .when there was an absence of `gasfrom the borev hole.y i ut, marsh-gas is quite often present and its presence can not alwaysbe determined, with the result that if -present there isan area of this highly combustible gas entirely envelopingthe match end of the, squib,and if the tip ofthe match endis-ignited,there is an instantaneous combustion of .this en-y l' tire ysurrounding area of marsh gas.A The result is, that, instead yof there `beinga'slov.' burning of the match endl of lthe fuse, it is ignitedythroughout Lits length immediately an'dp'the powder-carrying end of, the fuse being therebyignited almost siinultalneouslv. fires the blast,witliout va lapse of; time i cient for the miner to withdraw to a-safe Adistance. This is commonly known as vfpre-y ignition and often results ,inA injury `oi' possible deathrof the operator.I i i y In contrast to thev my device isdesigned to effectively tain a lapse of time l mainbetween the time of ig` nition of the match and the ignition ofthe powder carrying portion of the squib, and whereby pre-ignition is rendered impossible or at least improbable.

In the accompanying drawings,

Figure l is a vertical sectional view through the face of the minewall and illustrating the application of my device within the usual needle hole, the device being shown in side elevation; i

Figure 2 is a longitudinal through the device; i

Figure 3 is a view, similar to Figure 2 but taken at an angle of 90 thereto, and.

sectional view Figure 4 is a vertical section on the line 4l`4: of igure 3. i y,

Referring more specifically to the drawings by numerals of reference, 2 indicates a termed an isolator is formed from a metal tubular section of material 10,'usually ordinary piping, about a foot inlength and, its outside diameter at its central portion being about one suilifI y method ust,v descr.ibiec/l,A A

practically half linch while the inside diameter rarest, otr-ice.- I

is substantially one quarter inch throughout its length. i

For a ,portion ofl its length, preferably that portion lying between two points spaced approximately vfour inches from each end of the tube, the device is of uniform external diameter, as at 12, while the ends are tapered as atll, to a diameter at their extremities, such that either mayv beinserted within the needle hole 8, which at its lopening is ap- Y proxima-tely'three-eighths of an inch in diameter." i

` The central-portion of uniformdiameter is v provided j with twofseriesof diametrically transverse aperturesy 16'and 18 thetwo series being arranged vrespectively atV right angles from each other andaffording communication `between the bore of thetube `and the atmospherefor the escape of the gases which pass from the needle hole.

l and 138 arefurther so'arra'nged that those of y'one series are longitudinally'ofi'set from or alternate'with those of the other seriesg' In' actual practicethe squib or fuse isl in# The apertures 1,6

Therefore, .there are no gases in 'they vicinity. of the match end. When lighted, the match end slowly burns, givingfthe operator time to get a safe distance away before ignition of the -powder portion of the fuse takes place.

When the latter occurs, the fire passes inwardly through the tube and through vthe needle-hole to fire the blast.

f l Having thus described the construction and manner of using my device, what I claim as new and desire to protect by Letters Patent isi f c v 1. An isolator for use in firing blasts, comprising a tubular member adapted to be insertedwithin the mouth of a needle hole, i

said tubular member being provided Awith perforations intermediate its ends.y

2. An isolator for use in firing blasts, 'comprising a tubular member lprovided ntermedate its ends withv a series of transverse openings communicating with'the bore of said tubular members.y c f' 3..An isolator to gas' comprising a metal tubular' member provided intermediate its ends with a'longitudinal seriesfof transverse i openings passing through the wall of said tubular member, said tubular member being tapered toward one end.

f 4. An isolator to gas comprising a metal tubular member tapered at yeach end and provided intermediate its ends with la longitudinal series of radial openings penetrating the wall of said'tubular member.

In testimony whereof I affix my si nature.

WILLIAM IER. 

